A lego Trial Truck based on Mongo Heist Truck from Fast and Furious, features drives, steering, adjustable bodywork and two remote speed gearbox.
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Context

After some modules of GBC, I wanted to return to vehicle, especially trial truck. I have planned to build for a long time ago a trial truck version of the Mongo Heist Truck from Fast and Furious movies. Here it is.

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Functionality

The trial truck is equipped with two XL Motor and 4×4 drives with differential. I have add a simple remote two speed gearbox, enable good speed and more torque when it is needed. It works simply with a linear actuator which pushes the group of two XL with different gearing, no use of changeover cacth and driving ring here and enables a quick switch. The gearing is : XL motor : 12/20 or 16/16, 20t/differential, and 8/24 in portal hub live axle.

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The steering is operated by a servo motor placed in the front axle.

The original functionality here is the adjustable remote bodywork. In deed, it can be raise for more climbing abilities, and fall down to have lower center of gravity in downhill or toward. The whole bodywork is mounted on slide and connector rod on each side, which is connected to a linear actuator on the front, powered by a M motor. Thank to this, the bodywork is raised in parallel way using a parallelogram structure.

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The two battery box are placed each side of the frame to balanced the weigh. The frame is build on a simple U frame on the center and counter force leg to maximize the rigidity where the high travel suspension is attached. The whole model is quite heavy (around 2kg), but still powerful thanks to the two XL motor.

Design

The design is quite detailed with a equipped cabin with steering wheel, interior, seat, light and dashboard. Behind, there is two massive exhaust connected with ribbed hose on the center of the frame, no fake engine because of the room available, taken by the adjustable bodywork system. The two IR received is located in the back with a cosmetic chamber to hide them.

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I have tried to reproduce the style of Mongo Heist Truck with some adjustement regarding the light and reinforcement iron tube on each side.

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Pictures and Video

You can see it in functioning here :

I will not make building instructions but here is some pictures :

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